Daikin FXSQ125PVE4 [10/102] Floating te tc fixed te

Daikin FXSQ63PVE4 [10/102] Floating te tc fixed te
15 16
VRT-Variable Refrigerant Temperature
VRV IV
Heat Recovery
Heat Recovery
State-of-the-art energy saving technology
The new VRV IV system now features VRT technology.
VRT automatically adjusts refrigerant temperature to individual building and climate requirement,
thus further improving annual energy efficiency and maintaining comfort.
With this excellent technology, running costs are reduced.
Customise your VRV system for optimal annual efficiency
Basic mode is selected to maintain optimal comfort.
VRT is selected to save energy and prevent excessive cooling or heating.
Fine control to match user preference available through
mode selection
Recommended for use in these situations
During cooling, the refrigerant evaporating temperature (Te) is
raised to minimise the difference with the condensing
temperature.
During heating, condensing temperature (Tc) is lowered to
minimise the difference to the evaporating temperature.
Compressors work less, and this reduces power consumption.
How is energy reduced?
CompressorCompressor
(During cooling)
Evaporator
Condenser
Evaporating temperature raised
Compressor workload reduced
Indoor unit
heat exchanger
CompressorCompressor
Evaporator
Condenser
Indoor unit
heat exchanger
(During heating)
Condensing temperature lowered
Compressor workload reduced
Cooling load
& capacity
25%
100%
Outdoor
Temp.
35℃30℃25℃20℃
Capacity
changes
to match
heat load
Refrigerant cycle
Typical changes in evaporating temperature and COP depending on changing indoor load
Outdoor
Temp.
VRT
Without VRT
Low HighLow High
35℃30℃25℃20℃
Refrigerant evaporating
temp. / Te(℃)
Automatic control to
adjust temperature
Outdoor
Temp.
COP
35℃30℃25℃20℃
Without VRT
VRT
Low High
Required capacity changes
as air conditioning load
changes according to
outdoor temperature.
Energy efficiency is
improved without
sacrificing comfort.
Automatic control adjusts
evaporating temperature
to heat load change.
In case of fixed evaporating
temperature, excessive cooling,
thermo on-off loss, and other
inefficiencies occur.
Can boost capacity above 100% if needed.
The refrigerant temperature can go lower in cooling (higher in heating)
than the set minimum (maximum in heating).
Gives priority to very fast reaction speed.
The refrigerant temperature goes down (or up in heating) fast to keep
the room setpoint stable.
Gives priority to fast reaction speed.
The refrigerant temperature goes down (or up in heating) fast to keep
the room setpoint stable.
Gives priority to efficiency.
The refrigerant temperature goes down (or up in heating) gradually giving
priority to the efficiency of the system instead of the reaction speed.
Mild
mode
Quick
mode
Powerful
mode
Variable Refrigerant Temperature
Fixed Refrigerant
Temperature
High Sensible Mode
Fixed target Te
Auto Mode
Floating target Te/Tc depending on heat load
(Default setting on VRV IV)
Basic Mode
Fixed Te/Tc - Standard control
Unable to change Te
Powerful ModePowerful Mode
Reaction speed
Very Fast
Quick ModeQuick Mode
Reaction speed
Fast
Mild ModeMild Mode
Reaction speed
Medium
(Default setting on VRV IV)
Eco ModeEco Mode
Energy saving priorityCapacity priority
40
35
30
25
20
15
0
Mar. Jun. Sep. Dec.
Av. max. temp. Av. daily temp. difference
Av. min. temp.
(Typical example)
Outdoor Temp. (ºC)
VRT is particularly effective at night when
temperatures are low.
40
35
30
25
20
15
0
Mar. Jun.
Sep. Dec.
Av. max. temp.
Heating
period
Heating
period
Intermediate
period
Intermediate
period
Cooling period
Av. min. temp.
Outdoor Temp. (ºC)
Set temperature
Very Fast
Time
30
Start of
cooling
25
Fast
Medium
Indoor Temp. (ºC)
VRT offers quicker cool down
to shorten uncomfortable pull down time.
Mild
Quick
Powerful
Floating Te/ Tc Fixed Te
(Typical example)
Cooling only regions having differences
in daily temperature.
Cooling/heating regions having periods
of mild outdoor temperatures.
VRT is particularly effective during the intermediate periods.
Selecting VRT enables operation to be optimised for either
energy efficiency or rapid cooling/heating.
* VRT is only available during either all cooling operation or all heating operation.

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